CN111759547A

CN111759547A - Personalized pelvis prosthesis

Info

Publication number: CN111759547A
Application number: CN202010640830.6A
Authority: CN
Inventors: 杨庆诚; 程冬冬; 史春宝; 许奎雪; 刘钊; 焦树豪
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2020-10-13

Abstract

The invention relates to the technical field of medical instruments, and provides a personalized pelvis prosthesis. The method comprises the following steps: the method comprises the following steps: the bone nail comprises a solid part of titanium alloy, a large-aperture bone trabecula part of titanium alloy, a small-aperture bone trabecula part of titanium alloy, a wing plate of titanium alloy and a titanium alloy self-tapping bone nail; the large-aperture trabecular bone part of the titanium alloy comprises a first large-aperture trabecular bone and a second large-aperture trabecular bone, and the small-aperture trabecular bone part of the titanium alloy comprises a first small-aperture trabecular bone and a second small-aperture trabecular bone; the number of the titanium alloy self-tapping bone nails is multiple, and the installation positions of the titanium alloy self-tapping bone nails on the solid part of the titanium alloy correspond to the bone positions connected by the titanium alloy self-tapping bone nails. The invention has the beneficial effects that: the prosthesis is connected with the skeleton by 10 bone nails, the bone nails are divided into four groups, and the dispersed and grouped distribution of the bone nails strengthens the initial stability of the prosthesis.

Description

Personalized pelvis prosthesis

Technical Field

The invention relates to the technical field of medical instruments, in particular to a personalized pelvis prosthesis.

Background

Acetabular tumors are one of the bone tumors, consisting of the ilium, ischium, pubis, which often occur in two or three of the bones affected simultaneously, forming a periacetabular tumor.

Surgical approaches to acetabular tumors are currently divided into two categories: firstly, half pelvis amputation, operation can reach radical tumor excision, but the patient has consequently lost affected side limbs and one side pelvis, and quality of life is low and the outward appearance is incomplete, and the patient is mostly difficult to accept. And secondly, reconstructing a half pelvis, namely reconstructing acetabulum by methods such as tumor bone inactivation and replanting, allogenic half pelvis transplantation, artificial half pelvis prosthesis reconstruction and the like after tumor resection, recovering the load bearing and walking functions of hip joints and retaining most functions of lower limbs.

The defect of tumor bone inactivation and replantation is that the local recurrence rate is relatively high, the incision is infected, the bone-knitting end is not healed, and the like; the defects of allogenic half-pelvis transplantation are non-healing of cut, infection, bone absorption, non-healing of bone-knitting end and the like caused by rejection reaction; the artificial semi-pelvis prosthesis can achieve firm fixation in the early stage and load-bearing walking in the early stage, and has quick function recovery, but complications such as screw fracture, prosthesis loosening, joint dislocation and the like occur in the later stage.

The prior art CN206560486U discloses an acetabulum periphery prosthesis structure, which solves the problem that the artificial hemipelvic prosthesis is easy to have complications such as screw fracture, prosthesis loosening and joint dislocation in the later period. But it still has the following disadvantages: (1) the prosthesis has larger weight and is not beneficial to the activity of the human body; (2) the prosthesis has stress concentration, which is not beneficial to the stability of the prosthesis; (3) the quantity of the bone nails of the prosthesis is less, which is not beneficial to the stability of the prosthesis at the initial stage; (4) the prosthesis bone is slowly expanded, which is not beneficial to the stability of the prosthesis at the initial stage; (5) the prosthesis bone has poor effect of expanding and is not favorable for the long-term stability of the prosthesis.

Disclosure of Invention

The invention aims to provide a personalized pelvis prosthesis to solve the technical problems in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: a personalized pelvic prosthesis, comprising: the bone nail comprises a solid part of titanium alloy, a large-aperture bone trabecula part of titanium alloy, a small-aperture bone trabecula part of titanium alloy, a wing plate of titanium alloy and a titanium alloy self-tapping bone nail; the large-aperture trabecular bone part of the titanium alloy comprises a first large-aperture trabecular bone and a second large-aperture trabecular bone, and the small-aperture trabecular bone part of the titanium alloy comprises a first small-aperture trabecular bone and a second small-aperture trabecular bone; the number of the titanium alloy self-tapping bone nails is multiple, and the installation positions of the titanium alloy self-tapping bone nails on the solid part of the titanium alloy correspond to the bone positions connected by the titanium alloy self-tapping bone nails.

In an alternative embodiment, the first large-aperture trabecular bone is disposed on an upper portion of the pelvic prosthesis, the first small-aperture trabecular bone is disposed around the first large-aperture trabecular bone along an edge of the pelvic prosthesis, and the first large-aperture trabecular bone is disposed adjacent to the second small-aperture trabecular bone.

In an alternative embodiment, the second large-aperture trabecular bone is disposed at the lower part of the pelvic prosthesis, and the second small-aperture trabecular bone is disposed between the second large-aperture trabecular bone and the first small-aperture trabecular bone and is disposed along the edge of the solid part.

In an optional embodiment, the first large-aperture bone trabecula, the second large-aperture bone trabecula, the first small-aperture bone trabecula and the second small-aperture bone trabecula are all printed in a 3D mode; the porosity of the first large-aperture bone trabecula I and the second large-aperture bone trabecula II is 50% -80%, and the pore diameter is 1.5 mm-3 mm; the porosity of the small-aperture trabecula I and the small-aperture trabecula II is 50% -80%, the part with the aperture of 100 um-200 um accounts for 40%, and the part with the aperture of 200 um-400 um accounts for 60%.

In an optional embodiment, the titanium alloy self-tapping bone nail comprises a first bone nail, a second bone nail, a third bone nail, a fourth bone nail, a fifth bone nail, a sixth bone nail, a seventh bone nail, an eighth bone nail, a ninth bone nail and a tenth bone nail; the major diameter of each titanium alloy self-tapping bone nail is 4-6 mm, the thread pitch is 1-2 mm, and the length of the screw rod is 30-150 mm.

In an optional embodiment, the first bone nail, the second bone nail and the ninth bone nail are screwed into the right pubis to connect the pelvic prosthesis and the human body; the third bone nail and the fourth bone nail are screwed into the right anterior superior iliac spine to connect the pelvic prosthesis and the human body; the fifth bone nail, the sixth bone nail, the seventh bone nail and the eighth bone nail are screwed into the right sacroiliac joint to connect the pelvis prosthesis and the human body; the bone nail is screwed into the ilium to connect the pelvis prosthesis and the human body.

In an optional embodiment, the number of the wing plates is two, the bone nail four and the bone nail three are respectively installed on the two wing plates, the wing plates are printed in a 3D mode, and the titanium alloy surfaces of the wing plates are polished.

In an optional embodiment, the solid part is 3D printed, and the titanium alloy surface of the solid part is polished.

In an alternative embodiment, the pelvic prosthesis is further provided with a large-radius part, and the radius of the large-radius part is R30-R50 mm.

The invention has the beneficial effects that:

(1) the invention adopts the large-aperture bone trabecula with the aperture of 1.5 mm-3 mm to reduce the weight of the prosthesis on the premise of meeting the use condition and performance.

(2) The invention adopts the large round angle with the radius of R30-R50 mm for transition, thereby effectively avoiding the problem of stress concentration.

(3) The invention adopts 10 bone nails to connect the prosthesis and the skeleton, and divides the bone nails into four groups, adopts distributed and grouped distribution to strengthen the initial stability of the prosthesis, and simultaneously adopts smaller screw pitch to realize good self-locking property and also play the role of stabilizing the prosthesis.

(4) In the invention, the part directly contacted with the bone adopts the small-aperture trabecula bone with the aperture of 100-200 um, which accounts for 40 percent of the total small-aperture trabecula bone and can realize faster bone ingrowth.

(5) The part of the bone-in bone grafting device directly contacted with the bone adopts a small-aperture bone trabecula structure with the aperture of 200-400 um, accounts for 60 percent of the total small-aperture bone trabecula, and can realize better bone ingrowth effect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a first overall schematic view of a personalized pelvic prosthesis according to an embodiment of the present invention.

Fig. 2 is a second overall schematic view of the personalized pelvic prosthesis according to an embodiment of the present invention.

Wherein, the reference numbers in the figures are: 1. the bone nail comprises a wing plate, 2, small-aperture bone trabecula I, 3, large-aperture bone trabecula I, 4, a solid part, 5, large-aperture bone trabecula II, 6, bone nails Ten, 7, small-aperture bone trabecula II, 8, bone nails IV, 9, bone nails III, 10, bone nails II, 11, bone nails I, 12, large-circular-angle parts, 13, bone nails V, 14, bone nails VI, 15, bone nails VII, 16 and bone nails VIII.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

Example one

Referring to fig. 1-2, the present embodiment provides a personalized pelvic prosthesis, including: the solid part 4 of titanium alloy, the large-aperture trabecular bone part of titanium alloy, the small-aperture trabecular bone part of titanium alloy, the wing plate 1 of titanium alloy and the titanium alloy self-tapping bone nail; the large-aperture bone trabecula part of the titanium alloy comprises a large-aperture bone trabecula I3 and a large-aperture bone trabecula II 5, and the small-aperture bone trabecula part of the titanium alloy comprises a small-aperture bone trabecula I2 and a small-aperture bone trabecula II 7.

Wherein the large-aperture trabecula I3 is arranged at the upper part of the pelvic prosthesis, the small-aperture trabecula I2 is arranged around the large-aperture trabecula I3 along the edge of the pelvic prosthesis, and the large-aperture trabecula I3 is arranged adjacent to the small-aperture trabecula I2. The second 5 large-aperture trabecular bone is arranged at the lower part of the pelvic prosthesis, and the second 7 small-aperture trabecular bone is arranged between the second 5 large-aperture trabecular bone and the first 2 small-aperture trabecular bone and is arranged along the edge of the solid part 4. 3D printing is carried out on the large-aperture bone trabecula I3, the large-aperture bone trabecula II 5, the small-aperture bone trabecula I2 and the small-aperture bone trabecula II 7, and the method needs to be pointed out that the large-aperture bone trabecula I3 and the large-aperture bone trabecula II 5 have the porosity of 50 percent and the aperture of 1.5mm, and the large-aperture bone trabecula with the aperture of 1.5mm is adopted to reduce the weight of the prosthesis on the premise of meeting the use conditions and the performance; the porosity of the small-aperture bone trabecula I2 and the porosity of the small-aperture bone trabecula II 7 are 50%, the pore diameter of the small-aperture bone trabecula II is 100um, the pore diameter of the small-aperture bone trabecula II accounts for 40%, faster bone growth can be achieved, the pore diameter of the small-aperture bone trabecula II accounts for 60%, and better bone growth effect can be achieved.

In this embodiment, the number of the titanium alloy self-tapping bone screws is plural, and the installation position of the titanium alloy self-tapping bone screws on the solid part 4 of the titanium alloy corresponds to the bone position connected with the titanium alloy self-tapping bone screws. Specifically, the titanium alloy self-tapping bone nail comprises a first bone nail 11, a second bone nail 10, a third bone nail 9, a fourth bone nail 8, a fifth bone nail 13, a sixth bone nail 14, a seventh bone nail 15, an eighth bone nail 16, a ninth bone nail 17 and a tenth bone nail 6; the major diameter of each titanium alloy self-tapping bone nail is 4mm, the thread pitch is 1mm, the length of the screw rod is 30mm, each bone nail adopts a smaller thread pitch, the self-locking performance is good, and the purpose of stabilizing the prosthesis is also achieved.

Wherein, the first bone nail 11, the second bone nail 10 and the ninth bone nail 17 are screwed into the right pubis to connect the pelvic prosthesis and the human body; the third bone nail 9 and the fourth bone nail 8 are screwed into the right anterior superior iliac spine to connect the pelvic prosthesis and the human body; screwing the five bone nails 13, six bone nails 14, seven bone nails 15 and eight bone nails 16 into the right sacroiliac joint to connect the pelvic prosthesis and the human body; the bone nail ten 6 is screwed into the ilium to connect the pelvis prosthesis and the human body. The prosthesis is connected with the skeleton by 10 bone nails which are divided into four groups, and the initial stability of the prosthesis is enhanced by adopting distributed and grouped distribution.

It should be mentioned that, in this embodiment, the number of wing plates 1 is two, the bone nail four 8 and the bone nail three 9 are respectively installed on the two wing plates 1, the wing plate 13D is printed, and the titanium alloy surface of the wing plate 1 is polished. The solid part 4 is manufactured by 3D printing, and the titanium alloy surface of the solid part 4 is polished. The pelvis prosthesis is also provided with a large round angle part 12, and the radius of the large round angle part 12 is R30mm, so that the problem of stress concentration is effectively avoided.

Example two

Wherein the large-aperture trabecula I3 is arranged at the upper part of the pelvic prosthesis, the small-aperture trabecula I2 is arranged around the large-aperture trabecula I3 along the edge of the pelvic prosthesis, and the large-aperture trabecula I3 is arranged adjacent to the small-aperture trabecula I2. The second 5 large-aperture trabecular bone is arranged at the lower part of the pelvic prosthesis, and the second 7 small-aperture trabecular bone is arranged between the second 5 large-aperture trabecular bone and the first 2 small-aperture trabecular bone and is arranged along the edge of the solid part 4. 3D printing is carried out on the large-aperture bone trabecula I3, the large-aperture bone trabecula II 5, the small-aperture bone trabecula I2 and the small-aperture bone trabecula II 7, and the method needs to be pointed out that the large-aperture bone trabecula I3 and the large-aperture bone trabecula II 5 have the porosity of 80 percent and the aperture of 3mm, and the large-aperture bone trabecula with the aperture of 3mm is adopted to reduce the weight of the prosthesis on the premise of meeting the use conditions and the performance; the porosity of the small-aperture bone trabecula I2 and the porosity of the small-aperture bone trabecula II 7 are 80%, the pore diameter of the small-aperture bone trabecula II is 200um, the pore diameter of the small-aperture bone trabecula II accounts for 40%, faster bone growth can be achieved, the pore diameter of the small-aperture bone trabecula II is 400um, the pore diameter of the small-aperture bone trabecula II accounts for 60%.

In this embodiment, the number of the titanium alloy self-tapping bone screws is plural, and the installation position of the titanium alloy self-tapping bone screws on the solid part 4 of the titanium alloy corresponds to the bone position connected with the titanium alloy self-tapping bone screws. Specifically, the titanium alloy self-tapping bone nail comprises a first bone nail 11, a second bone nail 10, a third bone nail 9, a fourth bone nail 8, a fifth bone nail 13, a sixth bone nail 14, a seventh bone nail 15, an eighth bone nail 16, a ninth bone nail 17 and a tenth bone nail 6; the major diameter of each titanium alloy self-tapping bone nail is 6mm, the thread pitch is 2mm, the length of the screw rod is 150mm, each bone nail adopts a smaller thread pitch, and the titanium alloy self-tapping bone nail has good self-locking performance and also has the purpose of stabilizing the prosthesis.

It should be mentioned that, in this embodiment, the number of wing plates 1 is two, the bone nail four 8 and the bone nail three 9 are respectively installed on the two wing plates 1, the wing plate 13D is printed, and the titanium alloy surface of the wing plate 1 is polished. The solid part 4 is manufactured by 3D printing, and the titanium alloy surface of the solid part 4 is polished. The pelvis prosthesis is also provided with a large round angle part 12, and the radius of the large round angle part 12 is R50mm, so that the problem of stress concentration is effectively avoided.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A personalized pelvic prosthesis, comprising: a solid part (4) of titanium alloy, a large-aperture bone trabecula part of titanium alloy, a small-aperture bone trabecula part of titanium alloy, a wing plate (1) of titanium alloy and a titanium alloy self-tapping bone nail; the large-aperture trabecula part of the titanium alloy comprises a first large-aperture trabecula (3) and a second large-aperture trabecula (5), and the small-aperture trabecula part of the titanium alloy comprises a first small-aperture trabecula (2) and a second small-aperture trabecula (7);

the method is characterized in that: the number of the titanium alloy self-tapping bone nails is multiple, and the installation positions of the titanium alloy self-tapping bone nails on the solid part (4) of the titanium alloy correspond to the bone positions connected by the titanium alloy self-tapping bone nails.

2. The personalized pelvic prosthesis of claim 1, wherein the first large-aperture trabecular bone (3) is disposed in an upper portion of the pelvic prosthesis, the first small-aperture trabecular bone (2) is disposed around the first large-aperture trabecular bone (3) along an edge of the pelvic prosthesis, and the first large-aperture trabecular bone (3) is disposed adjacent to the first small-aperture trabecular bone (2).

3. The personalized pelvic prosthesis of claim 2, wherein the second greater-aperture trabecular bone (5) is disposed in a lower portion of the pelvic prosthesis, and the second lesser-aperture trabecular bone (7) is disposed between the second greater-aperture trabecular bone (5) and the first lesser-aperture trabecular bone (2), and is disposed along an edge of the solid portion (4).

4. The personalized pelvic prosthesis of claim 3, wherein the first large-diameter bone trabecula (3), the second large-diameter bone trabecula (5), the first small-diameter bone trabecula (2), and the second small-diameter bone trabecula (7) are all 3D printed; the porosity of the large-aperture bone trabecula I (3) and the large-aperture bone trabecula II (5) is 50-80%, and the pore diameter is 1.5-3 mm; the porosity of the small-aperture bone trabecula I (2) and the small-aperture bone trabecula II (7) is 50% -80%, the part with the aperture of 100 um-200 um accounts for 40%, and the part with the aperture of 200 um-400 um accounts for 60%.

5. The personalized pelvic prosthesis of claim 1, wherein the titanium alloy self-tapping bone screws comprise bone screw one (11), bone screw two (10), bone screw three (9), bone screw four (8), bone screw five (13), bone screw six (14), bone screw seven (15), bone screw eight (16), bone screw nine (17), and bone screw ten (6); the major diameter of each titanium alloy self-tapping bone nail is 4-6 mm, the thread pitch is 1-2 mm, and the length of the screw rod is 30-150 mm.

6. The personalized pelvic prosthesis of claim 5, wherein the first (11), second (10) and ninth (17) nails are screwed into the right pubis to connect the pelvic prosthesis to the body; the third bone nail (9) and the fourth bone nail (8) are screwed into the right anterior superior iliac spine to connect the pelvic prosthesis and the human body; the fifth bone nail (13), the sixth bone nail (14), the seventh bone nail (15) and the eighth bone nail (16) are screwed into the right sacroiliac joint to connect the pelvic prosthesis and the human body; the bone nail ten (6) is screwed into the ilium to connect the pelvis prosthesis and the human body.

7. The personalized pelvic prosthesis according to claim 6, characterized in that the number of the wings (1) is two, the four (8) and three (9) nails are respectively mounted on the two wings (1), the wings (1) are 3D printed, and the titanium alloy surface of the wings (1) is polished.

8. The personalized pelvic prosthesis according to claim 1, characterized in that the solid portion (4) is 3D printed, the titanium alloy surface of the solid portion (4) being treated with a polishing treatment.

9. The personalized pelvic prosthesis of claim 1, wherein the pelvic prosthesis is further provided with a large fillet portion (12), the large fillet portion (12) having a radius of R30-R50 mm.